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Iec 3rd Year > 303 Gerneral Requirements For grounding And Bonding > Flashcards

303 Gerneral Requirements For grounding And Bonding Flashcards

1
Q

Resistance to earth is also commonly known as resistivity.

a. True
b. False

A

a. True

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2
Q

You connected the EGC to the copper main water service pipe above the ceiling. The plumber disconnected it and has left it disconnected. Because of this, if a “hot” branch circuit conductor contacts the EGC installed with the circuit, the branch circuit breaker will _____.

a. Take more than 3 times the normally required time to trip
b. Take approximately 2 seconds longer than normal to trip
c. Operate as it should

A

c. Operate as it should

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3
Q

Loose connections in a circuit conductor cause arcing and in turn oxidation occurs at the connection. This oxidation causes the total circuit resistance to ______.

a. Remain the same
b. Decreases
c. Increases

A

c. Increases

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4
Q

Because the connection is a fusion of high conductivity, Furseweld connections can withstand repeated fault current, and will not loosen in the way that mechanical connectors can.

a. True
b. False

A

a. True

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5
Q

Which of the following statements does NOT describe objectionable current?

a. Neutral current flowing over cable shields
b. Neutral current flowing over metal conduit
c. Neutral current flowing over the neutral conductor
d. Neutral current flowing over the equipment grounding conductor

A

c. Neutral current flowing over the neutral conductor

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6
Q

Lightning ionizes the air, thus making it a good ______. This enables electrons to travel from the clouds to the earth.

a. Insulator
b. Conductor

A

b. Conductor

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7
Q

During lightning strikes, electrons seek to return to _____.

I. Ground (earth). II. The Power source

a. I only
b. II only
c. Both I and II
d. Neither I nor II

A

a. I only

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8
Q

_____ Is where conductors and metal equipment are connected to establish electrical continuity and conductivity.

a. Grounding
b. Bonding 

A

b. Bonding

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9
Q

The maximum number of 3-pole circuit breakers used as service disconnect permitted in a three phase panel board is _____.

a. 42
b. 14
c. 3
d. 1
e. 6

A

d. 1

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10
Q

If a ground fault occurs, the branch circuit oh CPD will open most quickly when _____.

a. The branch circuit is installed in EMT and a separate EGC has been pulled
b. The branch circuit is installed an EMT as the only EGC
c. A ground rod is driven at the load and bonded to the metal load enclosure

A

a. The branch circuit is installed an EMT in a separate EDC has been pulled

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11
Q

Refer to figure 303.04. Without knowing the size of the conductors between the wire Way and switch #3, Which of the following best defines these conductors?

a. Tap
b. Feeder
c. Both a and b
d. Neither a or b

A

c. Both a and b

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12
Q

Refer to figure 303.04. The conductors between the transformer and switch 1Are best described as _____ conductors.

a. Tap
b. Secondary
c. Service
d. Branch circuit

A

b. Secondary

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13
Q

In figure 303.05, The grounding electrode conductor is shown at point ______.

a. I
b. II
c. III
d. IV

A

b. II

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14
Q

In figure 303.05, the equipment grounding conductor is shown at point _______.

a. I
b. II
c. III
d. IV

A

c. III

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15
Q

In figure 303.05, the main bonding jumper is shown at point _______.

a. I
b. II
c. III
d. IV

A

a. I

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16
Q

_____ is where conductors and metal equipment are connected together.

a. Grounding
b. Bonding

A

b. Bonding

17
Q

The NEC permits the grounded conductor for a 277-volt circuit to have an insulation color that is _____.

a. Gray
b. White
c. Green
d. Either a or b
e. a or b or c

A

d. Either a or b

18
Q

Systems are grounded to provide a path for ______.

I. Fault current. II. Lightning. III. Short-circuit current

a. I, II & III
b. II only
c. II & III only
d. III only
e. I & III only
f. I & II only

A

b. II only

19
Q

All NEC grounding requirements are covered in article 250.

a. True
b. False

A

b. False

20
Q

The purpose of the grounding electrode conductor and the grounding electrode is to establish a ground-fault path to open the circuit overcurrent protective device.

a. True
b. False

A

b. False

21
Q

Ionization of the air around an electrical arc can be a problem because the air becomes ______ and can cause the arc to last longer.

a. An insulator
b. A conductor

A

b. A conductor

Iec 3rd Year (4 decks)

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